newegg.com offers the OEM Pioneer 20x Serial ATA Internal Dual Layer DVD Burner in Black, model no DVR-216DBK, (pictured) for $29.99. With free shipping, that's the lowest total price we could find by $2. It burns DVD+R and DVD-R media at 20x, DVD-RAM media at 12x, dual layer DVD+R and dual layer DVD-R media at 8x, DVD+RW and DVD-RW media at 8x, CD-RW media at 24x, and CD-R media at 48x.

Also at newegg.com is the OEM Pioneer DVR-116DBK 20x IDE Internal Dual Layer DVD Burner in Black for $28.99 with free shipping. That's a buck under our July mention and the lowest total price we could find by $2.